I have a Weber Summit E470 NG grill. I've recently moved and am getting it setup at my new house. It looks like there's a natural gas regulator inside the base of the grill (which came with the grill from the factory) that steps the pressure down to the required PSI. My question is, can the 2 PSI gas supply in my house be connected directly to this regulator or should my plumber install another regular upstream from the grill? Thanks!